[the nub]

I don't care what anyone tells you but filtration and/or ionizers don't work. I've tried almost everything except exhaust, which IMO would be the most logical solution, if feasible. Ozone is the only other thing that is partially effective for long term, consisting smoking environments. It's the cumulative effect of smoke buildup that is the problem. Filtration can never get all of the smoke. Incense and other scents mask the odor but don't eliminate them. Sure, if you smoke once a week, only in the winter, then filters will work. So will candles. So will chanting voodoo.